CN103502997A - Point-of-transaction workstation for and method of imaging indicia over full coverage scan zone occupied by unskewed subfields of view - Google Patents
Point-of-transaction workstation for and method of imaging indicia over full coverage scan zone occupied by unskewed subfields of view Download PDFInfo
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- CN103502997A CN103502997A CN201280020487.9A CN201280020487A CN103502997A CN 103502997 A CN103502997 A CN 103502997A CN 201280020487 A CN201280020487 A CN 201280020487A CN 103502997 A CN103502997 A CN 103502997A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
- G06K7/10712—Fixed beam scanning
- G06K7/10722—Photodetector array or CCD scanning
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
- G06K7/10821—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum further details of bar or optical code scanning devices
- G06K7/1096—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum further details of bar or optical code scanning devices the scanner having more than one scanning window, e.g. two substantially orthogonally placed scanning windows for integration into a check-out counter of a super-market
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Abstract
A bi-optical, dual window, point-of-transaction workstation images indicia associated with multi-sided products over a full coverage scan zone by splitting each field of view of only two imagers into three subfields that pass through each window and fill the scan zone and minimize dead areas therein. Twisting of the subfields relative to the windows is minimized so that the subfields fit fully with minimal clipping through each window. Splitting of each field of view is remotely performed well away from each imager. The imagers have lens assemblies of substantially the same optical power and are spaced from their respective windows by substantially the same distance.
Description
Background technology
The known mark (such as bar code symbol) of using in Dual-window or two optics workstation based on laser and/or the reader based on imager come electric light to read and three-dimensional objects to be identified and that process is associated, for example in supermarket, the three-dimensional objects bought of the point-of-transaction workstation place that provides, the worktable place of the retailer's of jobbing house, department stores and other type cashier.Usually by the user, product is slided on worktable on general horizontal window facing up and/or the general vertical or vertical window that raises on worktable or mobile, or present to the central area of these windows.When at least one laser scanning line of the generation of the reader based on laser scans on symbol and/or when the back light from symbol is caught by the solid-state imager of the reader based on imager on visual field, so this symbol is processed, decode and read, thereby identify this product.
Symbol is positioned under product or upper or right-to-left, or between any side in six sides of product or on.Symbol can be directed by " fence " orientation, and wherein the elongation parallel strip of one dimension univeraal product code (UPC) symbol is vertical, or symbol can be directed by " ladder " orientation, and wherein the UPC symbol is level, or any orientation angles orientation between pressing.Product moves or presents between arbitrary window phase on arbitrary window, and product can be held with various angles of inclination by the user.During this movement or presenting, product can be oriented to contact or keep at a distance with arbitrary window.These all factors make character position variable and be difficult to look-ahead.
In this environment, importantly the reader at workstation place on horizontal window or vertically the window prerequisite for covering scanning area fully, make scanning area to downward-extension approach as far as possible worktable, enough height and wide as far as possible on the width of worktable on worktable.Scanning area projects to the space away from window, and aspect volume rapid growth, in order to not only cover the symbol be positioned on the product on window but also cover away from the symbol on the product of some inches of windows.Scanning area must be enough large in order to read the symbol that is positioned at the whole volume of scanning area in any possible mode, and must not have the wherein not capped any dead band that therefore can't read of symbol.
Process the same the having superiority of transaction with the workstation with the reader based on laser, think that the workstation (also referred to as imager) with the reader based on laser instrument can provide improved reliability and have the additional capabilities of the mark (such as two-dimentional or stacked or unblind) read except the UPC outer symbol and the ability that is-not symbol target (such as receipt, driving license, signature etc.) is carried out to imaging.Think at first all workstations based on imager will need approximately 10 to 12 or at least 6 imagers in order to reliably reading of the mark of all standing scanning area to realize the Shang any position, six sides to being positioned at three-dimensional objects is provided.Yet, for the cost that makes the workstation based on imager drops to acceptable level, knownly by the visual field by least one imager, being divided into a plurality of sub-visual fields, the demand to so many imager is reduced for replacing additional imager in every sub-visual field.
Yet this seed visual field (also referred to as the light collecting region) produced by the visual field of cutting apart in the known workstation based on imager also not exclusively covers scanning area.As a result, scanning area does not have and covers fully and have a dead band that mark can't be read.Equally, at least one a little visual field is twisted or the window that passes through with respect to them and crooked.As a result, the wall that the exterior section of the sub-visual field of distortion is limited the workstation of this window is pruned and stops.Certainly, these all factors make reading performance and deterioration of efficiency.
In addition, partly, due to the window of difference location and different size, known imager is provided with usually to have different focal powers and focuses on the imaging len assembly apart from window different distance place.In the prior art, disperse when they pass window the visual field of some distortions, and therefore when the mark to the window almost parallel carries out imaging, (common situations) reduced resolution, because the projection of each sensor on mark also is exaggerated.If mark is by the sub-view field imaging in the angled outside in the right side with workstation or left side, the projection of sensor on mark is stretched to the right side or left side.If mark is just by window center view field imaging in window towards the opposite, the sensor projection is to be stretched with being drawn into right angle of sub-visual field, outside.In other words, for each window, the sub-visual field that has high-resolution along the left/right axle is arranged, and also have the different sub-visual field that there is high-resolution along vertical up/down axle.
In prior art, for the anamorphic optics device that flattens this sub-visual field in sub-visual field by window on by the direction of certain angle projection, will make this sub-visual field be stretched, sensor is modified to resolution the degree that can't differentiate rightly high density marker thus.The anamorphic optics device of removing in the imaging len assembly will reduce the cost of workstation and increase manufacture efficiency.
Equally, cut apart visual field by optical splitter being positioned to approach very much imager to be carried out in the known workstation based on imager.Because the distance of every sub-visual field along with distance imager increases, in prior art, closely the positioning precision of adjacent optical splitter is very crucial, has increased labour intensive and expensive additive regulating step to manufacture process thus.In addition, because imager focuses on the outer distance (common several inches) of respective window, so approach the image of any mark of imager, be that non-norm is stuck with paste.When optical splitter is positioned to very approach imager, the edge of optical splitter is very fuzzy and can't focus on, and between divided sub-visual field profile clearly not.Because it is very little on spatial volume that each cuts apart sub-visual field, thisly fuzzyly can actual cover each and cut apart the live part of sub-visual field, waste thus valuable sensor and reduced the quantity of the sensor that can be used for telling the mark that is arranged in scanning area.
Summary of the invention
The present invention relates to the point-of-transaction workstation that mark to being associated with many sides product carries out electrooptical imaging.The bar code symbol that this mark is preferably read by electric light is in order to be identified at the purchased product in workstation place.In a preferred embodiment, workstation is two optics or Dual-window workstation, and this workstation has by outer casing supporting and is arranged in the general horizontal window of general surface level and also by outer casing supporting and be arranged in the vertical window of the general vertical plane crossing with general surface level.Vertical plane can be arranged in vertical plane, or can be with respect to vertical plane slightly backward or turn forward.Operator or client make product pass through scanning area, the space on this scanning area occupancy level window place and top, and also occupy the space of vertical window place and front.
At least one solid-state imager of outer casing supporting, be preferably two solid-state imagers, one of each window and being associated with each window.Preferably, two imagers are arranged on printed circuit board (PCB) jointly.Each imager has the sensor array of a plurality of sensors (also referred to as pixel), and this sensor has visual field.Each imager preferably includes two-dimensional charge coupled apparatus (CCD) array or complementary metal oxide semiconductor (CMOS) device (CMOS) array of the sensor of million Pixel Dimensions, and for example, the wide x960 pixel of 1280 pixel is high.Sensor array is along mutually orthogonal array axes layout, axle and row axle at once.Each imager comprises that the imaging len assembly is for catching the light returned from mark and projecting to sensor array for the back light by caught.Each imager can comprise luminaire or be associated with luminaire, for example to be used to, from the illumination light of lighting source (light emitting diode (LED)) this mark that throws light on.
Controller or programmable microprocessor are carried out illuminated sign for controlling each luminaire, catch the illumination light returned from mark at time shutter section or the frame electric signal with the mark that produces indication and be read for controlling each imager, and for the treatment of electric signal to read mark, and if this mark is-symbol this mark of decoding.Each luminaire is preferably only worked during the time shutter section.Each imager is controlled to catch the back light from mark during different time shutter sections, thereby avoids the interference between luminaire.
According to an aspect of the present invention, optical system by outer casing supporting and for the back light that catches along light path guiding from least one window to its imager be associated, and be divided into a plurality of sub-visual fields for the visual field by imager.Optical system has a plurality of refrative mirrors, each refrative mirror is arranged in light path, and with the corresponding mirror axle around being arranged essentially parallel to one of the capable axle that projects on corresponding mirror or row axle, the back light caught of at least one sub-visual field of above-mentioned sub-visual field to be occurred folding, to resist crooked with respect to a window of a sub-visual field.
As mentioned above, the window that at least some known sub-visual fields of prior art are passed with respect to them is distortion or crooked.As a result, the wall that the periphery of the sub-visual field of each distortion is limited the workstation of window is pruned and stops.In order to minimize this pruning (if not the words of this pruning of basic elimination), be arranged in the refrative mirror of light path of at least one sub-visual field with respect to capable axle and the careful locating and orienting of row axle of vertical imager.Particularly, each such refrative mirror has the mutually orthogonal mirror axle extended along the height of each mirror.Each refrative mirror is oriented to one of the capable axle that makes one of its mirror axle be basically parallel to project to this mirror or row axle.Therefore, each refrative mirror makes caught back light occur between mark and horizontal imaging device along its direction of propagation folding, and the linear edge that makes sub-visual field in linear edge a distance of distance window and be basically parallel to window is gone on the skew through horizontal window.Therefore, go to crooked sub-visual field more through window and applicable more fully this window.
According to another aspect of the present invention, optical system comprises the first optical splitter, for the visual field by imager, is divided into three sub-visual fields through one of window; And second optical splitter, be divided into three sub-visual fields through another window for another visual field by another imager.Therefore, only need two imagers to produce six sub-visual fields.These six sub-visual fields are provided at the optimum visibility through the mark on each side of the product of scanning area.Six sub-visual fields are oriented to for reading the mark with on the product of the most common mode orientation that the user presents to workstation the most effective.Six sub-visual fields provide the random covering of the mark that is positioned at product common location place, thereby guarantee maximum performance when being used by typical user.Yet, if the user presents product with square formula seldom, such as by with one of window, locating on the contrary this mark, sub-visual field still can be positioned to read this mark.
According to a further aspect of the invention, in the light path of at least one in refrative mirror between each imager and each optical splitter.In a preferred embodiment, each imager is for example, with window preset distance that is associated away from it (about 400mm) spaced apart along light path, and each optical splitter is positioned at 1/5 place away from its imager preset distance that is associated.Therefore, each optical splitter is located away from imager.As mentioned above, the requirement of prior art to high position precision alleviated in this long range positioning of optical splitter, and provides and more know profile between divided sub-visual field, increases thus the quantity of the sensor that can be used for differentiating the mark that is arranged in scanning area.
As mentioned above, window is differently located and the size difference.As some examples, the mean level window in conventional two optics workstations is arranged in surface level and measures approximately 4 inches wide and is multiplied by approximately 6 inches long, and general vertical window generally is arranged in dip plane and measure approximately 6 inches wide, is multiplied by approximately 8 inches long.This part ground causes prior art to be used having different focal powers and apart from the not confocal imaging len assembly at window different distance place.
Another aspect of the present invention is to provide two imaging len assemblies of two imagers with essentially identical focal power, and is the essentially identical long preset distance of window (for example, about 400mm) the interval imager to be associated away from it.Realize that by using a plurality of refrative mirrors this long light path allows to use the sensor of minimum number.Light path is longer, and the angle of divergence of sub-visual field is narrower, still realizes the sub-field size that the window place needs simultaneously.Because the angle of divergence is narrow, sub-visual field can Fast Growth outside window, has extended thus enough large working ranges of sensor resolution thereon.In other words, if use the shorter light path in workstation, be less than for example 400mm, the sub-field size at window place will be less, to such an extent as to or image resolution ratio will can not realize the real work scope exceeding outside window variation fast.
Of the present invention another is characterised in that by the mark to being associated with product and carries out the method that electrooptical imaging is processed these products.Carry out the method by following steps: by least one window of outer casing supporting; Catch the light returned from described mark by least one window on the visual field of at least one solid-state imager, at least one solid-state imager has the sensor array of arranging along mutually orthogonal array axes; The back light caught along the light path guiding is from least one window at least one imager; The visual field of at least one imager is divided into to a plurality of sub-visual fields; In light path, with the corresponding mirror axle around being arranged essentially parallel to one of array axes of projecting on corresponding mirror, the back light caught at least one sub-visual field in above-mentioned sub-visual field to be occurred folding for each in a plurality of refrative mirrors of location, to resist crooked with respect at least one window of at least one sub-visual field; And control at least one imager and process the back light caught at least one sub-visual field.
The present invention believes the feature specifically statement in claims with novelty.Yet the present invention itself is no matter be that its structure or its method of operating and extra purpose and advantage thereof will get the best understanding when reading specific embodiment by reference to the accompanying drawings from hereinafter describe.
The accompanying drawing explanation
Fig. 1 is the skeleton view according to Dual-window of the present invention, two optics point-of-transaction workstation or imaging reader, for reading by picture catching through the mark on many sides product of workstation;
Fig. 2 is the plan view from above for the sensor array of the imager of the workstation of Fig. 1;
Fig. 3 is division, the enlarged perspective of the part of the optical system in the workstation of Fig. 1, illustrates the folding light path of sub-visual field, outside of imager of Fig. 2 so that leave through vertical window;
Fig. 4 is amplification, the perspective side elevation view of the light path of Fig. 3;
Fig. 5 is the backside perspective view of the opticator of Fig. 3, has described to be divided into for the visual field by imager the optical splitter of the center visual field surrounded by sub-visual field, two outsides;
Fig. 6 is the plan view from above of the opticator of Fig. 3, illustrates the downstream, sub-visual field of optical splitter;
Fig. 7 is the skeleton view of the opticator of Fig. 3, illustrates three sub-visual fields of vertical window outside of the workstation of Fig. 1;
Fig. 8 is division, the enlarged perspective of another part of the optical system in the workstation of Fig. 1, is shown in another folded optical path that arrives the visual field of another imager before another optical splitter;
Fig. 9 is amplification, the perspective side elevation view of the light path part of Fig. 8;
Figure 10 is the skeleton view in downstream, sub-visual field of the optical splitter of pictorial image 8;
Figure 11 is the skeleton view in another downstream, sub-visual field of the optical splitter of pictorial image 8;
Figure 12 is the skeleton view of another opticator of Fig. 8, three sub-visual fields of the horizontal window outside of the workstation of pictorial image 1; And
Figure 13 is the skeleton view of the workstation of Fig. 1, whole six subfields of diagram window outside.
Embodiment
Fig. 1 describes the two optics point-of-transaction workstation 10 of Dual-window, for the mark 14 be associated with many sides three-dimensional objects 12 is carried out to electrooptical imaging, all as directed above-mentioned UPC symbols, this workstation is used for processing the transaction of the product 12 that relates to carrying or printing mark mark 14 usually by the retailer.Workstation 10 comprises shell 16, and this shell 16 has the general horizontal window 20 that is arranged in general surface level and is supported by horizontal exterior section 16A and is arranged in the general vertical plane intersected with general surface level and the vertical window 22 supported by the exterior section 16B raise.Vertical plane can be arranged in vertical plane, or can be with respect to vertical plane slightly backward or turn forward.Vertically preferably recessed its housing parts 16B of window 22 is so that anti-scratch.Operator or client make product pass through scanning area, the space on these scanning area occupancy level window 20 places and top, and also occupy the space of vertical window 22 places or front.
Mark 14 needs not to be as directed UPC symbol, and can be the unblind of all lengths of the one dimension symbol of distinct symbols system or random two-dimensional symbol or stacked symbol or the type usually found in loyalty card, reward voucher, accumulating card.Mark 14 can also be is-not symbol target, such as personnel's check, credit card, debit card, signature, driving license, consumer or operator.Catch the driving license image and be particularly useful, because a lot of driving license is with the two-dimensional marker coding of carrying age information, this age the checking client and client buy aspect the ability of the product (such as alcoholic beverage or tobacco product) relevant with the age useful.Capture operation person's image is for the video monitoring of security purpose.Therefore, can determine the operator whether the actual scanning product or in retail trade, be called in the crime practice of " reaching privately (sweethearting) " attempt walk around window and make product around window by and the consumer is not charged.
As Fig. 3-4 the best illustrates, the first solid-state imager 30 and the second solid-state imager 32 support on printed circuit board (PCB) 18 in the enclosure usually.Each imager 30,32 has the sensor array of some sensors, and visual field is illustrated by spot in each figure.As described below, the visual field of the first imager 30 is towards vertical window 22 outsides; Therefore, for convenient, the first imager 30 will be called separately vertical imager 30.Similarly, the visual field of the second imager 32 is towards horizontal window 20 outsides; Therefore, for convenient, the second imager 32 will be called separately horizontal imaging device 32.
Each imager 30,32 preferably includes two-dimensional charge coupled apparatus (CCD) array or complementary metal oxide semiconductor (CMOS) device (CMOS) array of the sensor of million Pixel Dimensions, and for example, the wide x960 pixel of 1280 pixel is high.In a preferred embodiment, the visual field test of each imager 30,32 approximately 15 degree be multiplied by 30 degree.The array of two imagers 30,32 extends along orthogonal row and column direction.Therefore, as shown in Figure 2, each imager has capable axle and row axle.Each imager 30,32 comprises that imaging len assembly 34,36(are referring to Fig. 4), for catching from the back light of mark and projecting to corresponding sensor array for the back light by caught, list.Each imager 30,32 can comprise luminaire or be associated with luminaire, for example to be used to, from the illumination light of one or more lighting sources (light emitting diode (LED) that install on surface) this mark that throws light on.LED can with the respective sensor array closely adjacent or with it away from.
Controller 24(is referring to Fig. 3) be arranged on equally on plate 18 and for controlling each luminaire so that the encoded microprocessor of this mark 14 that throws light on, for control each imager 30,32 open-assembly time section or frame detect from mark and return to and be imaged the illumination light that lens subassembly 34,36 catches, to produce the electric signal of indicating the mark be read, and for the treatment of this electric signal so that this mark 14 is carried out to imaging, and this mark of decoding when the mark is-symbol.Each luminaire is preferably only worked during the time shutter section.Each imager 30,32 is preferably controlled to catch the back light from mark during the time shutter section different, thereby avoids the interference between luminaire.
Each imager 30,32 preferably has global shutter, makes the image caught during the open-assembly time section can not be labeled 14 motion artifacts with respect to window.Also can adopt belt-type shutter or mechanical shutter.Mark 14 can the speed with 100 inches of about per seconds present or brush on any part of any window.For the imager of the mark that can read fast moving, mark must irradiate by illuminated device brightly, makes and can utilize short exposure time.The bright illumination light that arbitrarily window irradiates out may be horrible or uncomfortable for the user, thus illumination light can not the person of being operated or the nigh consumer that stands observe directly.
According to the present invention, optical system is by shell 16 supporting and for knowing that caught back light is along the first folded optical path from vertical window 22 to vertical imager 30, and along the second folded optical path from horizontal window 20 to horizontal imaging device 32.As described in more detail below, optical system also is divided into a plurality of sub-visual fields for the visual field by vertical imager 30, center visual field 30C in being surrounded by two external right and left sub-visual field 30R, 30L, and be divided into a plurality of sub-visual fields for the visual field by horizontal imaging device 32, center visual field 32C in being surrounded by two external right and left sub-visual field 32R, 32L.Each seed visual field of window shown in Figure 13 20,22 outsides.
Optical system has a plurality of refrative mirrors, and each is positioned in each in the first and second light paths, so that the back light caught in sub-visual field occurs to fold.As shown in Figure 3-4, a plurality of the first refrative mirrors 40,41,42,43 and 44 along vertical imager 30 and vertically the first light path location between window 22 so that the back light caught in outside sub-visual field 30L occur folding so that before by imaging len assembly 34, focusing on vertical imager 30 in the following order continuous reflection leave mirror 44,43,42,41 and 40.By similar mode, a plurality of the second refrative mirrors 40,45,46,47 and 48 are along the second light path location between vertical imager 30 and vertical window 22, so that the back light caught in outside sub-visual field 30R occurs is folding, so as before by imaging len assembly 34, to focus on vertical imager 30 in the following order continuous reflection leave mirror 48,47,46,45 and 40.A plurality of the 3rd refrative mirrors 40,49 and 50 are along the 3rd light path location between vertical imager 30 and vertical window 22, so that the back light caught in middle center visual field 30C occurs is folding, so as before by imaging len assembly 34, to focus on vertical imager 30 in the following order continuous reflection leave mirror 50,49 and 40.
As illustrated best in Fig. 5, above-mentioned mirror 41,45 and 49 comprises the first optical splitter, wherein mirror 49 is divided into middle center visual field 30C by the core of the visual field of vertical imager 30, wherein mirror 41 is divided into outside sub-visual field 30L by the exterior section of the visual field of vertical imager 30, and wherein mirror 45 is divided into outside sub-visual field 30R by another exterior section of the visual field of vertical imager 30.Fig. 6 has described best the individual passage of the sub-visual field 30L in outside between (from seen above) mirror 44,43,42,41 and 40 and has folded, and has also described the individual passage of the sub-visual field 30R in outside between mirror 48,47,46,45 and 40 and folded.Fig. 7 has described pass the individual passage of vertical window 22 and the sub-visual field 30L in the outside on mirror 44 and fold best, and passes the individual passage of vertical window 22 and the sub-visual field 30R in the outside on mirror 48 and fold.
As mentioned above, the window the 20, the 22nd that the known sub-visual field of at least some of prior art is passed with respect to them, distortion or crooked.As a result, the wall that the periphery of the sub-visual field of each distortion is limited the workstation of window 20,22 is pruned and stops.In order to minimize this pruning (if not the words of this pruning of basic elimination), be arranged in the refrative mirror 40,41,42,43 and 44 of the first light path part of outside sub-visual field 30L; Be arranged in the refrative mirror 40,45,46,47 and 48 of the second light path part of outside sub-visual field 30R; Be arranged in the refrative mirror 40,49 and the 50 capable axles with respect to vertical imager 30 and the careful locating and orienting of row axle of the 3rd light path part of outside sub-visual field 30C.Particularly, each such refrative mirror 40,41,42,43,44,45,46,47,48,49 and 50 has the mutually orthogonal mirror axle extended along the height of each mirror.Each such refrative mirror is oriented to one of the capable axle that makes one of its mirror axle be basically parallel to project to this mirror or row axle.Therefore, each such refrative mirror makes caught back light occur between mark and vertical imager 30 along its direction of propagation folding, and the linear edge that makes every sub-visual field 30C, 30L and 30R in the linear edge a distance apart from vertical window 22 and be basically parallel to vertical window 22 is gone on the skew through vertical window 22.Therefore, as Fig. 7 and 13 the bests are seen, each goes crooked sub-visual field 30C, 30L and 30R more through vertical window 22 and be applicable to more fully vertical window 22.
The above discussion of Fig. 3-7 relates to for folding and cut apart the various refrative mirrors of the optical system of removing crooked sub-visual field 30C, 30L and 30R between vertical window 22 and vertical imager 30.The following discussion of Fig. 8-12 relates to the additional fold mirror of optical system, for folding and cut apart additional between horizontal window 20 and horizontal imaging device 32 and remove to distort sub-visual field 32C, 32L and 32R.
Therefore, as shown in Fig. 8-9 the best, optical system comprises a plurality of the 4th refrative mirrors 60,61,62,63 and 64, the plurality of the 4th refrative mirror 60,61,62,63 and 64 along the first light path location between horizontal imaging device 32 and horizontal window 20 so that the back light caught in outside sub-visual field 32R occur folding so that before by imaging len assembly 36, focusing on horizontal imaging device 32 in the following order continuous reflection leave mirror 64,63,62,61 and 60.In a similar manner, a plurality of the 5th refrative mirrors 60,61,65,66 and 67 along the second light path location between horizontal imaging device 32 and horizontal window 20 so that the back light caught in outside sub-visual field 32L occur folding so that before by imaging len assembly 36, focusing on horizontal imaging device 32 in the following order continuous reflection leave mirror 67,66,65,61 and 60.A plurality of the 6th refrative mirrors 60,61,68 and 69 along the 3rd light path location between horizontal imaging device 32 and horizontal window 20 so that the back light caught in middle center visual field 32C occur folding so that before by imaging len assembly 36, focusing on horizontal imaging device 32 in the following order continuous reflection leave mirror 69,68,61 and 60.
As illustrated best in Fig. 8, above-mentioned mirror 62,65 and 68 comprises the second optical splitter, wherein mirror 68 is divided into middle center visual field 32C by the core of the visual field of horizontal imaging device 32, wherein mirror 62 is divided into outside sub-visual field 32R by the exterior section of the visual field of horizontal imaging device 32, and wherein mirror 65 is divided into outside sub-visual field 32L by another exterior section of the visual field of horizontal imaging device 30.Fig. 9 describe best mirror 61 and 60 and horizontal imaging device 32 between folding away from all three sub-visual fields of the second spectroscope 62,65 and 68.Figure 10 describes best the individual passage of the sub-visual field 32R in outside between mirror 62 and 63 and folds, also describe the individual passage of the sub-visual field 32L in outside between mirror 45 and 66 and fold, and also describe the individual passage of the middle center visual field 32C between mirror 68 and 69 and fold.Figure 11 describes best the individual passage of the sub-visual field 32R in outside between mirror 63 and 64 and folds; In a similar fashion, will understand outside sub-visual field 32L and pass through (not shown with the obstruction free accompanying drawing) between mirror 66 and 67.Figure 12 describes best through the individual passage of horizontal window 20 and the sub-visual field 32R in the outside on mirror 64 and folding and through the individual passage of horizontal window 20 and the sub-visual field 32L in the outside on mirror 67 and folding and through the individual passage of horizontal window 20 and the middle center visual field 32C on mirror 69 and folding.
As mentioned above, for minimum beggar visual field 32C, 32L and the pruning (if not the words of basic elimination this pruning) of 32R when they pass through horizontal window 20, be arranged in refrative mirror 60,61,68 and the 69 capable axles with respect to horizontal imaging device 32 and the careful locating and orienting of row axle of the 3rd light path part of center visual field 32C.Particularly, each such refrative mirror 60,61,68 and 69 has the mutually orthogonal mirror axle extended along the height of each mirror.Each such refrative mirror is oriented to one of the capable axle that makes one of its mirror axle be basically parallel to project to this mirror or row axle.Therefore, each such refrative mirror is propagated the folding back light caught along it between mark and horizontal imaging device 30, and the linear edge that makes sub-visual field 32C in linear edge a distance of distance horizontal window 20 and be basically parallel to horizontal window 20 is gone on the skew through horizontal window 20.
For other sub-visual field 32R and 32L, that sub-visual field 32R and 32L are occurred is folding for being parallel to array axes doing as antithetical phrase visual field 32C there is no enough spaces in shell 16.Therefore, sub-visual field 32R and 32L utilize the compound angle rotation of two outer mirrors 62,65 of the second optical splitter.These mirrors 62,65 have been introduced distortion, this distortion in the opposite direction by the light path towards horizontal window 20 further refrative mirror 63,64 and 66,67 down by compound angle, offset.When sub-visual field 32R and 32L leave horizontal window 20, this distortion almost completely is eliminated.Therefore, as Figure 13 the best is seen, each goes crooked sub-visual field 32C, 32L and 32R more through horizontal window 20 and applicable more fully horizontal window 22.
Therefore, only need two imagers 30,32 to produce six sub-visual fields.These six sub-visual fields are provided at the optimum visibility through the mark on each side of the product of scanning area.Six sub-visual fields are oriented to for reading the mark with on the product of the most common mode orientation that the user presents to workstation the most effective.Six sub-visual fields provide the random covering of the mark that is positioned at product common location place, thereby guarantee maximum performance when being used by typical user.Yet, if the user presents product with square formula seldom, such as by with one of window telltale mark on the contrary, sub-visual field still can be positioned to read this mark.
To recognize, in the light path of at least one in refrative mirror between each imager and each optical splitter.Therefore, in the light path of refrative mirror 40 between vertical imager 30 and the first optical splitter 41,45 and 49; In the light path of refrative mirror 60,61 between horizontal imaging device 32 and the second optical splitter 62,65 and 68.In a preferred embodiment, (for example about 400mm) is spaced apart along light path with window 22,20 preset distances that are associated away from it for each imager 30,32, and each optical splitter is positioned at 1/5 place away from its imager preset distance that is associated.Therefore, the imager location that each optical splitter is associated away from it.As mentioned above, the requirement of prior art to high position precision alleviated in this long range positioning of optical splitter, and provides and more know profile between divided sub-visual field, increases thus the quantity of the sensor that can be used for differentiating the mark that is arranged in scanning area.
As mentioned above, window 20,22 is differently located and the size difference.As some examples, the mean level window 20 in conventional two optics workstations is arranged in surface level and measures approximately 4 inches wide and is multiplied by approximately 6 inches long, and general vertical window 22 generally is arranged in dip plane and measure approximately 6 inches wide, is multiplied by approximately 8 inches long.This part ground causes prior art to be used having different focal powers and apart from the not confocal imaging len assembly at window 20,22 different distance places.
It is not preferably distortion that another aspect of the present invention is to provide two imaging len assemblies 34, the 36(of two imagers 30,32 with essentially identical focal power), and be that the essentially identical long preset distance of window 22,20 (for example, about 400mm) to be associated away from it makes imager 30,32 spaced apart.Preferably, the light path part of each in sub-visual field 30C, 30R, 30L, 32C, 32R and 32L is roughly the same between its respective window imager corresponding to it.Realize that by using a plurality of refrative mirrors this long light path allows to use the sensor of minimum number.Light path is longer, and the angle of divergence of sub-visual field is narrower, still realizes the sub-field size that the window place needs simultaneously.Because the angle of divergence is narrow, sub-visual field can Fast Growth outside window, extends thus the enough working ranges of sensor resolution.
In use, the operator, such as the consumer at the people in the work of supermarket check out counters place or oneself checkout platform place, process the product 12 of carrying UPC symbol 14 on it, by slipping over product 12 or come through window 20,22 by present product 12 at the respective window place on respective window.Symbol 14 can be arranged on the either side of top side, bottom side, right side, left side, front side and rear side of product 12, and in imager 30,32 at least one or may the two all catch through one or two window 20,22 from symbol 14 emissions, scattering or the illumination light returned.All three sub-visual field 32C, 32R and 32L pass horizontal window 20 to read three sides of product along difference intersecting direction.All three sub-visual field 30C, 30R and 30L pass vertical window 22 to read three sides again of product along difference intersecting direction.As shown in figure 13, six sub-visual fields occupy scanning area basically fully.As a result, any dead band that can't read mark 14 in scanning area minimizes basically.
Be appreciated that and two or more in each or these key elements in aforementioned key element can in other type structure different from the aforementioned type structure, find useful application scenario.
Although having illustrated and put down in writing, the present invention is presented as by using two imager electric light to read the point-of-transaction workstation of mark, however details shown in not being intended to be limited to, because can not break away from make multiple correction and structural change of the present invention spiritually.
Without further analysis, to such an extent as to the content of front has so intactly disclosed main idea of the present invention already, other people can use existing knowledge easily it to be made change and can not ignore some features for various application scenarios, these features reasonably well form the essential feature of general or concrete aspect of the present invention from the position of prior art, and therefore these changes should with the implication that is intended to the equivalent of claims below and scope in understood.
Set forth claimed which type of fresh content and required to be subject to literal patent protection in appended claims.
Claims (20)
1. a point-of-transaction workstation, carry out electrooptical imaging for the mark by being associated with product and process described product, comprising:
Shell;
At least one window by described outer casing supporting;
At least one solid-state imager, described at least one solid-state imager is by described outer casing supporting and, for catch the light returned from described mark by described at least one window on visual field, described at least one imager has the array of the sensor of arranging along mutually orthogonal array axes;
Optical system, described optical system is by described outer casing supporting and for guide the back light caught from described at least one window to described at least one imager along light path, and be divided into a plurality of sub-visual fields for the visual field by described at least one imager, described optical system has a plurality of refrative mirrors, each refrative mirror is arranged in described light path, and with the corresponding mirror axle around being arranged essentially parallel to one of array axes of projecting on corresponding mirror, the back light caught of at least one sub-visual field of described sub-visual field to be occurred folding to resist crooked with respect to described at least one window of described at least one sub-visual field, and
Controller, for controlling described at least one imager and for the treatment of the back light caught of described at least one sub-visual field.
2. workstation as claimed in claim 1, is characterized in that, described at least one window is arranged in vertical plane; And also comprise another window that is arranged in the general surface level intersected with described vertical plane; By another solid-state imager of described outer casing supporting, for catch the light returned from described mark by another window on another visual field, and there is the array of the sensor of arranging along mutually orthogonal array axes; And printed circuit board (PCB), the array of two imagers is mounted thereon jointly.
3. workstation as claimed in claim 2, is characterized in that, described optical system comprises: the first optical splitter is divided into a plurality of sub-visual field through a window for the visual field by described at least one imager; And second optical splitter, be divided into a plurality of sub-visual field through another window for another visual field by another imager; And in the light path of at least one in wherein said refrative mirror between described at least one imager and described the first optical splitter, and at least another light path between another imager and the second optical splitter in wherein said refrative mirror.
4. workstation as claimed in claim 2, is characterized in that, described optical system comprises: the first optical splitter is divided into a plurality of sub-visual field through a window for the visual field by described at least one imager, and second optical splitter, for another visual field of another imager is divided into to a plurality of sub-visual field through another window, and wherein said at least one imager is spaced apart with the first distance of described at least one window of distance along described light path, and wherein said the first optical splitter is positioned at 1/5 place of the first distance of described at least one imager of distance, and wherein said another imager is spaced apart with the second distance of described another window of distance along described light path, and wherein said the second optical splitter is positioned at 1/5 place of the second distance of described another imager of distance.
5. workstation as claimed in claim 3, is characterized in that, each array is upward to described general surface level; Wherein said at least one refrative mirror is positioned on described at least one imager; And wherein said at least another refrative mirror is positioned on described another imager.
6. workstation as claimed in claim 2, is characterized in that, described optical system comprises: the first optical splitter is divided into three sub-visual fields through a window for the visual field by described at least one imager; And second optical splitter, for another visual field of another imager is divided into to three sub-visual fields through another window, and wherein said the first optical splitter comprises three spectroscopes, for described visual field being divided into to the sub-visual field, two outsides of center visual field and encirclement described middle center visual field, and wherein around the mirror axle that is basically parallel to one of array axes of projecting at least one imager on corresponding spectroscope, the back light caught in corresponding sub-visual field to be occurred folding for each spectroscope, to resist crooked with respect to a window of every sub-visual field.
7. workstation as claimed in claim 2, is characterized in that, described optical system comprises: the first optical splitter is divided into three sub-visual fields through a window for the visual field by described at least one imager, and second optical splitter, for another visual field of another imager is divided into to three sub-visual fields through another window, and two outside spectroscopes that wherein said the second optical splitter comprises the center spectroscope that is used to form middle center visual field and is used to form the sub-visual field, two outsides that surrounds described middle center visual field, and wherein said center spectroscope makes the back light caught in described middle center visual field occur folding around the mirror axle that is basically parallel to one of array axes of projecting to another imager on the spectroscope of described center, to resist crooked with respect to another window of described middle center visual field, and its peripheral spectroscope be tilt to make outside sub-visual field rotation with respect to another window and to go crooked.
8. workstation as claimed in claim 4, is characterized in that, each window has linear edge; And wherein said optical system guide sub-visual field in the linear edge a distance apart from each window and be basically parallel to each window linear edge and through each window.
9. workstation as claimed in claim 2, it is characterized in that, the back light that described optical system guiding catches is along the first light path part from least one window at least one imager, and the back light that also guiding catches is along being substantially equal to the second light path part of the first light path part from another window to another imager on length.
10. workstation as claimed in claim 2, is characterized in that, two imagers have the substantially the same imaging len assembly of focal power.
11. one kind is carried out by the mark to being associated with product the method that electrooptical imaging is processed described product, said method comprising the steps of:
By at least one window of outer casing supporting;
Catch the light returned from described mark by least one window on the visual field of at least one solid-state imager, described at least one solid-state imager has the array of the sensor of arranging along mutually orthogonal array axes;
The back light caught along the light path guiding is from least one window at least one imager;
The visual field of described at least one imager is divided into to a plurality of sub-visual fields;
Each in described light path in a plurality of refrative mirrors in location, with the corresponding mirror axle around being arranged essentially parallel to one of array axes of projecting on corresponding mirror, the back light caught at least one sub-visual field in described sub-visual field is occurred folding, to resist crooked with respect at least one window of described at least one sub-visual field; And
Control described at least one imager and process the back light caught in described at least one sub-visual field.
12. method as claimed in claim 11, is characterized in that, described at least one window is arranged in vertical plane; And another window of location in the general surface level intersected with described vertical plane, and catch the light returned from described mark by another window on another visual field of another solid-state imager, described another solid-state imager has the array of the sensor of arranging along mutually orthogonal array axes, and the array of two imagers is installed on printed circuit board (PCB) jointly.
13. method as claimed in claim 12, is characterized in that, segmentation procedure is carried out by the first optical splitter and the second optical splitter, and described the first optical splitter is for being divided into a plurality of sub-visual field through a window by the visual field of described at least one imager; Described the second optical splitter is for being divided into a plurality of sub-visual field through another window by another visual field of another imager, and at least one in refrative mirror is positioned in the light path between described at least one imager and described the first optical splitter, and by described refrative mirror at least another is positioned in the light path between another imager and the second optical splitter.
14. method as claimed in claim 12, is characterized in that, segmentation procedure is carried out by the first optical splitter and the second optical splitter, and described the first optical splitter is for being divided into a plurality of sub-visual field through a window by the visual field of described at least one imager; Described the second optical splitter is for being divided into a plurality of sub-visual field through another window by another visual field of another imager, and spaced apart described at least one imager of the first distance along described light path with described at least one window of distance, and described the first optical splitter is positioned to 1/5 place of the first distance of described at least one imager of distance, and spaced apart described another imager of second distance along described light path with described another window of distance, and described the second optical splitter is positioned to 1/5 place apart from the second distance of described another imager.
15. method as claimed in claim 13, is characterized in that, each array configurations is become upward to described general surface level; And described at least one refrative mirror is positioned on described at least one imager; And described at least another refrative mirror is positioned on described another imager.
16. method as claimed in claim 12, it is characterized in that, segmentation procedure is carried out by the first optical splitter and the second optical splitter, described the first optical splitter is for being divided into three sub-visual fields through a window by the visual field of described at least one imager, described the second optical splitter is for being divided into three sub-visual fields through another window by another visual field of another imager, and described the first optical splitter is configured to have three spectroscopes so that described visual field is divided into to the sub-visual field, two outsides of middle center visual field and encirclement described middle center visual field, and wherein each spectroscope makes the back light caught in corresponding sub-visual field occur folding around the mirror axle that is basically parallel to one of array axes of projecting at least one imager on corresponding spectroscope, to resist crooked with respect to a window of every sub-visual field.
17. method as claimed in claim 12, it is characterized in that, segmentation procedure is carried out by the first optical splitter and the second optical splitter, described the first optical splitter is for being divided into three sub-visual fields through a window by the visual field of described at least one imager, described the second optical splitter is for being divided into three sub-visual fields through another window by another visual field of another imager, and two outside spectroscopes that described the second optical splitter are configured to have the center spectroscope that is used to form middle center visual field and are used to form the sub-visual field, two outsides that surrounds described middle center visual field, and wherein said center spectroscope makes the back light caught in described middle center visual field occur folding around the mirror axle that is basically parallel to one of array axes of projecting to another imager on the spectroscope of described center, to resist crooked with respect to another window of described middle center visual field, and make outside spectroscope tilt make outside sub-visual field rotation with respect to another window and go crooked.
18. method as claimed in claim 14, is characterized in that, each window is configured to have linear edge, and guide sub-visual field in the linear edge a distance apart from each window and be basically parallel to each window linear edge and through each window.
19. method as claimed in claim 12, it is characterized in that, the back light that guiding catches is along the first light path part from least one window at least one imager, and the back light that also guiding catches is along being substantially equal to the second light path part of the first light path part from another window to another imager on length.
20. method as claimed in claim 12, is characterized in that, two imagers are configured to have the substantially the same imaging len assembly of focal power.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US13/094,081 | 2011-04-26 | ||
| US13/094,081 US9033236B2 (en) | 2011-04-26 | 2011-04-26 | Point-of-transaction workstation for and method of imaging indicia over full coverage scan zone occupied by unskewed subfields of view |
| PCT/US2012/034144 WO2012148760A1 (en) | 2011-04-26 | 2012-04-19 | Point-of-transaction workstation for and method of imaging indicia over full coverage scan zone occupied by unskewed subfields of view |
Publications (2)
| Publication Number | Publication Date |
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| CN103502997A true CN103502997A (en) | 2014-01-08 |
| CN103502997B CN103502997B (en) | 2016-05-04 |
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| CN201280020487.9A Active CN103502997B (en) | 2011-04-26 | 2012-04-19 | Mark is carried out point-of-transaction workstation and the method for imaging on all standing scanning area that goes to crooked sub-visual field to occupy |
Country Status (5)
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| US (1) | US9033236B2 (en) |
| EP (1) | EP2702527A1 (en) |
| CN (1) | CN103502997B (en) |
| AU (1) | AU2012250104A1 (en) |
| WO (1) | WO2012148760A1 (en) |
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| CN106339647A (en) * | 2015-07-09 | 2017-01-18 | Ncr公司 | Multiple View Single Camera Imaging Scanner |
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Also Published As
| Publication number | Publication date |
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| US20120273572A1 (en) | 2012-11-01 |
| EP2702527A1 (en) | 2014-03-05 |
| CN103502997B (en) | 2016-05-04 |
| WO2012148760A1 (en) | 2012-11-01 |
| AU2012250104A1 (en) | 2013-10-24 |
| US9033236B2 (en) | 2015-05-19 |
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